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(civl261)[2009](s)quiz7b~PPSpider^_10071.pdf
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CIVL 261 C Traffic and Transportation Engineering
Tutorial Quiz 7B April 1, 2009
Name : Student ID :
Geometric Design of Highways C Horizontal Curve
A horizontal curve through mountainous terrain is being designed for a four-lanes road with lanes that are 3.0m wide. The central angle () is 40 degrees, the tangent distance is 155m, and the stationing of the tangent intersection (PI) is 7 + 270.000. Under specified conditions and vehicle speed, the roadway surface is determined to have a coefficient of side friction of 0.08, and the curves super-elevation is 9.0%. What is the stationing of the PC and PT? What is the safe vehicle speed?

Solution:

The stationing of PC is



The stationing of PT is



The radius of curvature of the innermost lane is


Therefore,